diff --git a/library/IuUP_Emulation.ttcn b/library/IuUP_Emulation.ttcn
index 19c2c84..899ba50 100644
--- a/library/IuUP_Emulation.ttcn
+++ b/library/IuUP_Emulation.ttcn
@@ -100,7 +100,7 @@
 			} else {
 				/* store an INIT_ACK to be transmitted later */
 				st.pending_tx_pdu := valueof(ts_IuUP_INIT_ACK(pdu.type_14.frame_nr,
-									pdu.type_14.iuup_version));
+									pdu.type_14.u.proc.hdr.iuup_version));
 			}
 		} else if (match(pdu, tr_IuUP_INIT_ACK)) {
 			if (st.cfg.active_init == true) {
@@ -127,7 +127,7 @@
 			if (st.cfg.active_init) {
 				if (not isvalue(st.pending_tx_pdu)) {
 					/* send INIT */
-					pdu := valueof(ts_IuUP_INIT('160051673C01270000820000001710000100'O));
+					pdu := valueof(ts_IuUP_INIT(ts_IuUP_PDU14_ProcSending_INIT));
 					st.pending_tx_pdu := pdu;
 				} /* else: wait for INIT-ACK return ''O at the end */